<div class="container-fluid">
  <div class="card">
    <div class="card-body">
      <div class="form-group">
        <textarea [(ngModel)]="text" class="form-control" rows="5"></textarea>
      </div>
      <button [disabled]="!text" class="btn btn-danger" (click)="postMessage()">Public</button>
    </div>
  </div>
</div>
